<template>
  <div>
    <router-link tag="div" to="/" v-show="showAbs" class="header-abs">
      <div class="iconfont header-abs-back">&#xe602;</div>
    </router-link>
    <div class="header-fixed" v-show="!showAbs" :style="opacityStyle">
      <router-link to="/">
        <div class="iconfont header-fixed-back">&#xe602;</div>
      </router-link>
      景点详情
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      showAbs: true,
      opacityStyle: {
        opacity: 0
      }
    };
  },
  methods: {
    handleScroll() {
      console.log("scroll");
      const top = document.documentElement.scrollTop;
      if (top > 60) {
        let opacity = top / 140;
        opacity = opacity > 1 ? 1 : opacity;
        this.opacityStyle = {
          opacity: opacity
        };
        this.showAbs = false;
      } else {
        this.showAbs = true;
      }
      //   console.log(document.documentElement.scrollTop)
    }
  },
    // activated() {
    //   window.addEventListener("scroll", this.handleScroll);

    // },
    // deactivated(){
    //   window.removeEventListener("scroll", this.handleScroll)
    // }
  mounted() {
    window.addEventListener("scroll", this.handleScroll);
  },
  destroyed() {
    window.removeEventListener("scroll", this.handleScroll);
  }
};
</script>

<style lang="stylus" scoped>
@import '~@/assets/styles/varibles.styl'
    .header-fixed
        z-index 2
        position fixed
        top 0
        left 0 
        right 0
        height $headerHeight
        line-height $headerHeight
        text-align center
        color #fff
        background $bgColor
        font-size .32rem
        .header-fixed-back
            position absolute 
            width .64rem
            text-align center
            font-size .4rem
            top 0
            left 0
            color #fff
    .header-abs
        position absolute
        left .2rem
        top .2rem
        width .8rem
        height .8rem
        border-radius .4rem
        text-align center
        line-height .8rem
        background rgba(0,0,0,.8 )
        .header-abs-back
            color #fff
            font-size .4rem
  
</style>
